add 2nd parameter to SkFontHost::NextLogicalFont()

needed by android to map different styles of fallback fonts



git-svn-id: http://skia.googlecode.com/svn/trunk@1562 2bbb7eff-a529-9590-31e7-b0007b416f81

include/core/SkFontHost.h

@@ -150,14 +150,22 @@ public:
     */
     static SkScalerContext* CreateScalerContext(const SkDescriptor* desc);
 
-    /** Given a "current" fontID, return the next logical fontID to use
-        when searching fonts for a given unicode value. Typically the caller
-        will query a given font, and if a unicode value is not supported, they
-        will call this, and if 0 is not returned, will search that font, and so
-        on. This process must be finite, and when the fonthost sees a
-        font with no logical successor, it must return 0.
-    */
-    static uint32_t NextLogicalFont(SkFontID fontID);
+    /**
+     *  Given a "current" fontID, return the next logical fontID to use
+     *  when searching fonts for a given unicode value. Typically the caller
+     *  will query a given font, and if a unicode value is not supported, they
+     *  will call this, and if 0 is not returned, will search that font, and so
+     *  on. This process must be finite, and when the fonthost sees a
+     *  font with no logical successor, it must return 0.
+     *
+     *  The original fontID is also provided. This is the initial font that was
+     *  stored in the typeface of the caller. It is provided as an aid to choose
+     *  the best next logical font. e.g. If the original font was bold or serif,
+     *  but the 2nd in the logical chain was plain, then a subsequent call to
+     *  get the 3rd can still inspect the original, and try to match its
+     *  stylistic attributes.
+     */
+    static SkFontID NextLogicalFont(SkFontID currFontID, SkFontID origFontID);
 
     ///////////////////////////////////////////////////////////////////////////
 

include/core/SkScalerContext.h

@@ -189,6 +189,7 @@ private:
     };
 public:
     struct Rec {
+        uint32_t    fOrigFontID;
         uint32_t    fFontID;
         SkScalar    fTextSize, fPreScaleX, fPreSkewX;
         SkScalar    fPost2x2[2][2];

src/core/SkPaint.cpp

@@ -1234,7 +1234,8 @@ void SkScalerContext::MakeRec(const SkPaint& paint,
                               const SkMatrix* deviceMatrix, Rec* rec) {
     SkASSERT(deviceMatrix == NULL || !deviceMatrix->hasPerspective());
 
-    rec->fFontID = SkTypeface::UniqueID(paint.getTypeface());
+    rec->fOrigFontID = SkTypeface::UniqueID(paint.getTypeface());
+    rec->fFontID = rec->fOrigFontID;
     rec->fTextSize = paint.getTextSize();
     rec->fPreScaleX = paint.getTextScaleX();
     rec->fPreSkewX  = paint.getTextSkewX();

src/core/SkScalerContext.cpp

@@ -180,7 +180,7 @@ static SkScalerContext* allocNextContext(const SkScalerContext::Rec& rec) {
     // fonthost will determine the next possible font to search, based
     // on the current font in fRec. It will return NULL if ctx is our
     // last font that can be searched (i.e. ultimate fallback font)
-    uint32_t newFontID = SkFontHost::NextLogicalFont(rec.fFontID);
+    uint32_t newFontID = SkFontHost::NextLogicalFont(rec.fFontID, rec.fOrigFontID);
     if (0 == newFontID) {
         return NULL;
     }

src/ports/SkFontHost_android.cpp

@@ -632,7 +632,7 @@ size_t SkFontHost::GetFileName(SkFontID fontID, char path[], size_t length,
     }
 }
 
-uint32_t SkFontHost::NextLogicalFont(uint32_t fontID) {
+SkFontID SkFontHost::NextLogicalFont(SkFontID currFontID, SkFontID origFontID) {
     load_system_fonts();
 
     /*  First see if fontID is already one of our fallbacks. If so, return
@@ -642,7 +642,7 @@ uint32_t SkFontHost::NextLogicalFont(uint32_t fontID) {
      */
     const uint32_t* list = gFallbackFonts;
     for (int i = 0; list[i] != 0; i++) {
-        if (list[i] == fontID) {
+        if (list[i] == currFontID) {
             return list[i+1];
         }
     }

src/ports/SkFontHost_fontconfig.cpp

@@ -364,8 +364,7 @@ SkTypeface* SkFontHost::Deserialize(SkStream* stream) {
     return NULL;
 }
 
-// static
-uint32_t SkFontHost::NextLogicalFont(SkFontID fontID) {
+SkFontID SkFontHost::NextLogicalFont(SkFontID currFontID, SkFontID origFontID) {
     // We don't handle font fallback, WebKit does.
     return 0;
 }

src/ports/SkFontHost_linux.cpp

@@ -578,7 +578,7 @@ size_t SkFontHost::GetFileName(SkFontID fontID, char path[], size_t length,
     return 0;
 }
 
-uint32_t SkFontHost::NextLogicalFont(uint32_t fontID) {
+SkFontID SkFontHost::NextLogicalFont(SkFontID currFontID, SkFontID origFontID) {
     return 0;
 }
 

src/ports/SkFontHost_mac_atsui.cpp

@@ -491,9 +491,9 @@ SkScalerContext* SkFontHost::CreateScalerContext(const SkDescriptor* desc) {
     return new SkScalerContext_Mac(desc);
 }
 
-uint32_t SkFontHost::NextLogicalFont(uint32_t fontID) {
+SkFontID SkFontHost::NextLogicalFont(SkFontID currFontID, SkFontID origFontID) {
     uint32_t newFontID = find_default_fontID();
-    if (newFontID == fontID) {
+    if (newFontID == currFontID) {
         newFontID = 0;
     }
     return newFontID;

src/ports/SkFontHost_mac_coretext.cpp

@@ -887,10 +887,10 @@ SkScalerContext* SkFontHost::CreateScalerContext(const SkDescriptor* desc) {
     return new SkScalerContext_Mac(desc);
 }
 
-SkFontID SkFontHost::NextLogicalFont(SkFontID fontID) {
+SkFontID SkFontHost::NextLogicalFont(SkFontID currFontID, SkFontID origFontID) {
     SkFontID nextFontID = 0;
     SkTypeface* face = GetDefaultFace();
-    if (face->uniqueID() != fontID) {
+    if (face->uniqueID() != currFontID) {
         nextFontID = face->uniqueID();
     }
     return nextFontID;

src/ports/SkFontHost_none.cpp

@@ -80,7 +80,7 @@ SkScalerContext* SkFontHost::CreateScalerContext(const SkDescriptor* desc) {
     return NULL;
 }
 
-uint32_t SkFontHost::NextLogicalFont(uint32_t fontID) {
+SkFontID SkFontHost::NextLogicalFont(SkFontID currFontID, SkFontID origFontID) {
     return 0;
 }
 

src/ports/SkFontHost_simple.cpp

@@ -620,7 +620,7 @@ size_t SkFontHost::GetFileName(SkFontID fontID, char path[], size_t length,
     }
 }
 
-uint32_t SkFontHost::NextLogicalFont(uint32_t fontID) {
+SkFontID SkFontHost::NextLogicalFont(SkFontID currFontID, SkFontID origFontID) {
     load_system_fonts();
 
     /*  First see if fontID is already one of our fallbacks. If so, return
@@ -630,7 +630,7 @@ uint32_t SkFontHost::NextLogicalFont(uint32_t fontID) {
      */
     const uint32_t* list = gFallbackFonts;
     for (int i = 0; list[i] != 0; i++) {
-        if (list[i] == fontID) {
+        if (list[i] == currFontID) {
             return list[i+1];
         }
     }

src/ports/SkFontHost_win.cpp

@@ -179,7 +179,7 @@ SkTypeface* SkCreateTypefaceFromLOGFONT(const LOGFONT& origLF) {
     return face;
 }
 
-uint32_t SkFontHost::NextLogicalFont(uint32_t fontID) {
+SkFontID SkFontHost::NextLogicalFont(SkFontID currFontID, SkFontID origFontID) {
   // Zero means that we don't have any fallback fonts for this fontID.
   // This function is implemented on Android, but doesn't have much
   // meaning here.